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📐 Mathematics  ·  Trigonometric Functions  ·  JEE

If sin θ = 3/5 and θ is in second quadrant, find tan 2θ.

Answer: -24/7.

  • A -24/7
  • B 24/7
  • C -7/24
  • D 7/24

Correct answer: A. -24/7

Explanation: Q2: sinθ=3/5, cosθ=−4/5 (cosine is negative in Q2). tanθ=sinθ/cosθ=−3/4. Double-angle formula: tan2θ=2tanθ/(1−tan²θ)=2(−3/4)/(1−9/16)=(−3/2)/(7/16)=−24/7.

xy0 deg30 deg45 deg (1/sqrt2, 1/sqrt2)60 deg90 degcos45sin45

Unit circle with standard angles 0, 30, 45, 60, 90 degrees; at 45 degrees the point is (cos45, sin45) = (1/sqrt2, 1/sqrt2).

Concept context

Ratios, identities, and applications in triangles

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